120 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Bill, very slightly hooked, not wide and flat at base, as in the 

 Flycatchers; toes, joined together at base. Plain colored birds, usu- 

 ally greenish or grayish, but often show a faint wash of yellow on 

 under parts; tail, always without white spots; first primary, variable, 

 very short in some species; in others nearly as long as second. 



Family VIREONID^E. Vireos. 

 See page 227. 



PART 2. Tip of upper mandible, not notched or hooked. 



First primary, not short, never less than two thirds as long as 

 second or third; bill, stout and conical; nostrils, high near the cul- 

 men; primaries, 9; tarsus, flattened behind. 



Top.lof bill. 



Family FRINGILLID^. 



Sparrows, Finches, Buntings, etc. 



See page 190. 



First primary, not short, never less than 

 two thirds as long as third, and often nearly 

 the same length; bill, slender and pointed; 

 back of tarsus, thin and sharp, not rounded 

 as in front; hind toe and claw, not longer 

 than middle toe and claw. 



Family MNIOTILTID^. Warblers. 



See page 231. 



